The Lenovo Z Z400 uses an 11.1 V lithium-ion battery in the roughly 48 to 57 Wh range, and one of the common part numbers across this category is L11L6F01. Because the Z400 sits in the later generation of the line, its pack is typically internal and reached by removing the bottom case. Always confirm the part number printed on your existing battery or listed in your service manual before ordering, since look-alike models in the Z family do not all share the same pack. The price is $56.99.

Match your exact sub-series and the part number on your current battery rather than guessing from screen size. Flip the laptop over (or open the bottom panel on internal models) and read the label, which shows a number such as L11L6F01. Compare that against the listing, since this category spans about 13 models across 2 distinct part numbers and the early and late generations are not cross-compatible. The packs here are all 11.1 V lithium-ion in the 48 to 57 Wh range, so voltage alone will not separate them.

A Lenovo Z replacement battery costs $56.99 in this category. That single price covers the 2 distinct part numbers fitting about 13 compatible models, all 11.1 V lithium-ion packs in the roughly 48 to 57 Wh range. Because the price is consistent across the line, your main job is matching the correct part number, such as L11L6F01, to your exact sub-series rather than shopping on price. Check the label on your old battery before you order so you receive the pack that fits your generation.

Not across the whole line. The Lenovo Z series shifted from externally accessible packs in earlier models to internal designs in later ones, so an early Z560 and a later Z400 take different batteries even though both run at 11.1 V. This category uses 2 distinct part numbers covering about 13 models, and they are not freely swappable between generations. Confirm the number on your current pack, such as L11L6F01, and match it exactly. Same voltage does not guarantee the same fit, connector, or cell count.

The biggest difference is how the battery mounts and how many cells it carries. Earlier sub-series like the Z560 and Z565 generally use externally accessible packs with sliding latches, while later models like the Z400 tend to use internal packs reached by removing the bottom case. Across the line the voltage holds steady at 11.1 V and capacity ranges from about 48 to 57 Wh, but part numbers differ by sub-series and year. This category carries 2 distinct part numbers, including L11L6F01, so identifying your exact model matters.

Look on the battery itself first. On external models, release the sliding latches and read the label, which lists a number such as L11L6F01 along with the 11.1 V rating. On internal models like the Z400, the number is printed on the pack inside the chassis, reachable after removing the bottom case, and is often repeated in the service manual or on a sticker under the laptop. Match that exact string to the listing, since this category spans 2 part numbers across about 13 models in the 48 to 57 Wh range.

Yes, in most cases. Earlier Lenovo Z models such as the Z560 and Z565 use externally accessible packs that release with sliding latches, so the swap takes seconds with no tools. Later models like the Z400 use internal batteries, which means removing the bottom case screws, unplugging the connector, and lifting out the pack rated at 11.1 V. Either way, power down first, confirm the part number such as L11L6F01, and seat the replacement firmly. The packs in this category run 48 to 57 Wh and install in the original position.

Watch for runtime that drops sharply, a charge that stalls below full, or a laptop that shuts off the moment you unplug it. You might also see the system report poor battery health or hold a charge for only a short stretch on a pack originally rated near 48 to 57 Wh at 11.1 V. If your Lenovo Z runs fine plugged in but cannot stay on unplugged, the lithium-ion cells have likely worn down. A replacement using the correct part number, such as L11L6F01, restores normal portable use for $56.99.